Accumulator

Abstract

Provided is an accumulator for easier maintenance of a metal bellows. The accumulator includes a housing having a shell provided with an opening portion and a disk-shaped base body to which one end of a metal bellows with an outside diameter smaller than the inside diameter of the opening portion is welded and fixed, the interior of the housing partitioned on the inside and outside of the metal bellows in a tightly closed manner, in which the base body is formed to have an outside diameter greater than the outside diameter of the metal bellows, and the base body is fixed detachably to the shell.

The invention claimed is: 
     
       1. An accumulator comprising:
 a housing having a shell provided with an opening portion and a base body formed in a disk shape; and 
 a bellows made of metal and having an outer diameter smaller than an inner diameter of the opening portion, 
 one end portion of the bellows being welded and fixed to the base body, an interior of the housing being partitioned into an inner space and an outer space of the bellows in a tightly closed manner, wherein 
 the base body has an outer diameter greater than the outer diameter of the bellows, and the base body is fixed detachably to the shell, and 
 an inner peripheral surface of the shell is provided with a restrictive stepped portion with which an outer peripheral portion of the base body is in contact. 
 
     
     
       2. The accumulator according to  claim 1 , further comprising:
 an annular seal member provided between the outer peripheral portion of the base body and the inner peripheral surface of the shell; and 
 a fixing member formed as a discrete body separate from the base body and configured to fix the base body to the shell. 
 
     
     
       3. The accumulator according to  claim 2 , wherein the fixing member has an outer peripheral portion provided with a male screw portion screwed into a female threaded portion provided in the inner peripheral surface of the shell. 
     
     
       4. The accumulator according to  claim 3 , wherein
 the fixing member is annular. 
 
     
     
       5. The accumulator according to  claim 2 , wherein
 the fixing member is annular. 
 
     
     
       6. The accumulator according to  claim 1 , wherein
 the base body is provided with a through hole in communication with the inner space of the bellows. 
 
     
     
       7. The accumulator according to  claim 1 , wherein
 the base body is key-fitted into the shell. 
 
     
     
       8. An accumulator comprising:
 a housing having a shell provided with an opening portion and a base body formed in a disk shape; and 
 a bellows made of metal and having an outer diameter smaller than an inner diameter of the opening portion, 
 one end portion of the bellows being welded and fixed to the base body, an interior of the housing being partitioned into an inner space and an outer space of the bellows in a tightly closed manner, wherein 
 the base body has an outer diameter greater than the outer diameter of the bellows, and the base body is fixed detachably to the shell, and 
 the accumulator further comprises: 
 an annular seal member provided between the outer peripheral portion of the base body and the inner peripheral surface of the shell; and 
 a fixing member formed as a discrete body separate from the base body and configured to fix the base body to the shell. 
 
     
     
       9. The accumulator according to  claim 8 , wherein the fixing member has an outer peripheral portion provided with a male screw portion screwed into a female threaded portion provided in the inner peripheral surface of the shell. 
     
     
       10. The accumulator according to  claim 9 , wherein
 the fixing member is annular. 
 
     
     
       11. The accumulator according to  claim 9 , wherein
 the base body is provided with a through hole in communication with the inner space of the bellows. 
 
     
     
       12. The accumulator according to  claim 9 , wherein
 the base body is key-fitted into the shell. 
 
     
     
       13. The accumulator according to  claim 8 , wherein
 the fixing member is annular. 
 
     
     
       14. The accumulator according to  claim 13 , wherein
 the base body is provided with a through hole in communication with the inner space of the bellows. 
 
     
     
       15. The accumulator according to  claim 13 , wherein
 the base body is key-fitted into the shell. 
 
     
     
       16. The accumulator according to  claim 8 , wherein
 the base body is provided with a through hole in communication with the inner space of the bellows. 
 
     
     
       17. The accumulator according to  claim 8 , wherein
 the base body is key-fitted into the shell.